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04.8.md

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@@ -36,7 +36,7 @@ Example 4.13 [presuffix.go](examples/chapter_4/presuffix.go)
strings.Contains(s, substr string) bool
##4.7.3 判断子字符串或字符在父字符串中出现的位置（索引）：
##4.7.3 判断子字符串或字符在父字符串中出现的位置（索引）
`Index` 返回字符串 `str` 在字符串 `s` 中的索引（`str` 的第一个字符的索引），-1 表示字符串 `s` 不包含字符串 `str`：
strings.Index(s, str string) int